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The Physics of UV Light
Articles that focus on how the physics laws govern UV light behaviour and impact UV disinfection effectiveness.


UV Reflection & Surface Interaction: Why the Room Matters
UV-C does not simply disappear when it reaches a surface. Explore how reflection, absorption, scattering and different materials influence UV exposure — and why the room itself plays an important role in real-world UV disinfection performance.

Simon Ellison
Aug 179 min read


UV Distance Matters: Why Intensity Changes Dramatically Across a Room
Distance has a major influence on UV disinfection performance. Explore why UV intensity falls as distance increases, what the inverse square law really means, and why surfaces within the same room can receive dramatically different levels of UV exposure.

Simon Ellison
Aug 117 min read


UV Shadowing: Why It Reduces UV Disinfection Effectiveness
Shadows are one of the biggest challenges in UV disinfection, yet they're often misunderstood. Learn why shadowing occurs, how it affects UV dose delivery, and the practical strategies that can significantly improve real-world disinfection performance.

Simon Ellison
Aug 75 min read
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